<template>
    <div>
          <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
        <!-- 提示区 -->
          <el-alert
    title="添加商品信息"
    type="info"
    center
    show-icon :closable="false">
  </el-alert>
  <!-- 步骤条 -->
  <el-steps :space="200" align-center :active="activeIndex - 0 " finish-status="success">
  <el-step title="基本信息"></el-step>
  <el-step title="商品参数"></el-step>
  <el-step title="商品属性"></el-step>
  <el-step title="商品图片"></el-step>
  <el-step title="商品内容"></el-step>
  <el-step title="完成"></el-step>
</el-steps>

<!-- tab栏区域 -->
<el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
<!-- 居左显示left '':代表是字符串 -->
<el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTbaLeave" @tab-click="tabClicked">
    <el-tab-pane label="基本信息" name="0">
        <el-form-item label="商品名称" prop="goods_name">
            <el-input v-model="addForm.goods_name"></el-input>
        </el-form-item>
         <el-form-item label="商品价格" prop="goods_price">
             <!-- type="number"规定它只能输入 数字 -->
            <el-input v-model="addForm.goods_price" type="number"></el-input>
        </el-form-item>
         <el-form-item label="商品重量" prop="goods_weight">
            <el-input v-model="addForm.goods_weight" type="number"></el-input>
        </el-form-item>
         <el-form-item label="商品数量" prop="goods_number">
            <el-input v-model="addForm.goods_number" type="number"></el-input>
        </el-form-item>
        <el-form-item label="商品分类" prop="goods_cat">
            <el-cascader
           expand-trigger="hover"
    v-model="addForm.goods_cat"
    :options="catelist"
    :props="cateProps"
    @change="handleChange"></el-cascader>
        </el-form-item>
    </el-tab-pane>
    <el-tab-pane label="商品参数" name="1">
        <!-- 渲染表单的item项 -->
        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id" >
            <!-- 复选框组 -->
            <el-checkbox-group v-model="item.attr_vals">
    <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
  </el-checkbox-group>
        </el-form-item>
    </el-tab-pane>
    <el-tab-pane label="商品属性" name="2">
        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
            <el-input v-model="item.attr_vals"></el-input>
        </el-form-item>
    </el-tab-pane>
    <el-tab-pane label="商品图片" name="3">
        <!-- action 表示图片要上传到的后台API地址 -->
        <el-upload
  :action="uploadURL"
  :on-preview="handlePreview"
  :on-remove="handleRemove"
  list-type="picture" :headers="headerObj" :on-success="handleSuccess">
  <el-button size="small" type="primary">点击上传</el-button>
</el-upload>
    </el-tab-pane>
    <el-tab-pane label="商品内容" name="4">
        <!-- 富文本编辑器组件 -->
        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
        <!-- 添加商品的按钮 -->
        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
    </el-tab-pane>
  </el-tabs>
  </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog
  title="图片预览"
  :visible.sync="previewVisible"
  width="50%">
  <img :src="previewPath" alt="" class="previewImg">
</el-dialog>
    </div>
</template>


<script>
import _ from 'lodash'

export default {
    // data:私有数据
    data(){
        // return一个对象
        return {
            activeIndex: '0',
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组
                goods_cat:[],
                // 图片的数组
                pics:[],
                // 商品详情描述
                goods_introduce: '',
                attrs: []
            },
            addFormRules:{
                goods_name: [
                    { required: true,message: '请输入商品名称',trigger: 'blur' }
                ],
                goods_price: [
                    { required: true,message: '请输入商品价格',trigger: 'blur' }
                ],
                goods_weight: [
                     { required: true,message: '请输入商品重量',trigger: 'blur' }
                ],
                goods_number: [
                    { required: true,message: '请输入商品数量',trigger: 'blur' }
                ],
                goods_cat:[
                    { required: true,message: '请选择商品分类',trigger: 'blur' }
                ]
            },
            // 商品分类数组
            catelist: [],
            cateProps: {
                label:'cat_name',
                value:'cat_id',
                children: 'children'
            },
            // 动态参数列表数据
            manyTableData:[],
            // 静态属性列表属性
            onlyTableData: [],
            // 上传图片的URL地址
            uploadURL: 'http://www.ysqorz.top:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            previewPath: '',
            previewVisible: false
        }
    },
    // 生命周期函数
    created(){
        this.getCateList()
    },
    // 所有的事件处理函数，它是一个对象
    methods:{
        // 获取所有商品分类数据
        async getCateList(){
            const {data: res} = await this.$http.get('categories')
            if(res.meta.status !== 200){
                return this.$message.console.error('获取商品分类失败！');
            }
            this.catelist = res.data
            console.log(this.catelist)
        },
        // 级联选择器选中项变化，会触发这个函数
        handleChange(){
            console.log(this.addForm.goods_cat)
            if(this.addForm.goods_cat.length !==3 ){
                this.addForm.goods_cat = []
            }
        },
        beforeTbaLeave(activeName, oldActiveName){
            // console.log('即将历来的标签页名字是：' + oldActiveName)
            // console.log('即将进入的标签页名字是：' + activeName)
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error('请选择商品分类！')
                return false
            }
        },
        async tabClicked(){
            // 证明访问的是动态参数
            if(this.activeIndex === '1'){
                // console.log('动态参数面板')
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } 
                })
                if(res.meta.status !== 200){
                    return this.$message.error('获取动态参数失败!')
                }
                console.log(res.data)
                res.data.forEach(item => {
                    item.attr_vals = 
                    item.attr_vals.length === 0 ? []
                    : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            } else if(this.activeIndex === '2'){
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } 
                })
                if(res.meta.status !== 200){
                    return this.$message.error('获取静态属性失败！')
                }
                console.log(res.data)
                this.onlyTableData = res.data
            }
        },
        // 处理图片预览效果
        handlePreview(file){
            console.log(file)
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file){
              console.log(file)
            // 1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2.从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filePath)
            // 3.调用数组的slice方法，把图片信息对象，从pics数组中移除
            this.addForm.pics.splice(i, 1)
            //  console.log(this.addForm)
        },
        // 监听图片上传成功的事件
        handleSuccess(response){
            // 1.拼接得到一个图片信息对象 
            const picInfo = { pic:response.data.tmp_path } 
            // 2.将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
             console.log(this.addForm)
        },
        // 添加商品
        add(){
            // 表单预验证
            this.$refs.addFormRef.validate(async valid => {
                if(!valid){
                    return this.$message.error('请填写必要的表单项！')
                }
                // 执行添加的业务逻辑
                // lodash  提供 clonDeep(obj)    深拷贝  在这里要操作form,而不是addForm
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item => {
                    // attr_value只接收字符串，所以join，每一项之间用空格隔开(' ')
                    const newInfo = {attr_id: item.attr_id,attr_value: item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态参数
                this.onlyTableData.forEach(item => {
                    // 这里静态参数的attr_value本身就是一个字符串
                    const newInfo = { attr_id: item.attr_id,attr_value: item.attr_vals }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form)

                // 发起请求添加商品
                // 商品的名称，必须是唯一的
                const {data: res} = await this.$http.post('goods', form)
                if(res.meta.status !== 201){
                    return this.$message.error('添加商品失败！')
                }
                this.$message.success('添加商品成功！')
                this.$router.push('/goods')
            })
        }
    },
    computed: {
        cateId(){
            if(this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 5px 0 0 !important;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>